The Cover Display, what you'll see when the device is closed and looks more like a regular phone, is 4.58 inches and has a 21:9 aspect ratio. Samsung said it has a resolution of 840x1960, with a screen density of 420 dpi.
The Main Display, the bigger screen you see when unfolding the phone, is 7.3 inches and has a 4.2:3 aspect ratio. Samsung said the resolution is 1536x2152, with a screen density of 420 dpi.